linux/include/linux/timekeeper_internal.h
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   1/*
   2 * You SHOULD NOT be including this unless you're vsyscall
   3 * handling code or timekeeping internal code!
   4 */
   5
   6#ifndef _LINUX_TIMEKEEPER_INTERNAL_H
   7#define _LINUX_TIMEKEEPER_INTERNAL_H
   8
   9#include <linux/clocksource.h>
  10#include <linux/jiffies.h>
  11#include <linux/time.h>
  12
  13/* Structure holding internal timekeeping values. */
  14struct timekeeper {
  15        /* Current clocksource used for timekeeping. */
  16        struct clocksource      *clock;
  17        /* NTP adjusted clock multiplier */
  18        u32                     mult;
  19        /* The shift value of the current clocksource. */
  20        u32                     shift;
  21        /* Number of clock cycles in one NTP interval. */
  22        cycle_t                 cycle_interval;
  23        /* Number of clock shifted nano seconds in one NTP interval. */
  24        u64                     xtime_interval;
  25        /* shifted nano seconds left over when rounding cycle_interval */
  26        s64                     xtime_remainder;
  27        /* Raw nano seconds accumulated per NTP interval. */
  28        u32                     raw_interval;
  29
  30        /* Current CLOCK_REALTIME time in seconds */
  31        u64                     xtime_sec;
  32        /* Clock shifted nano seconds */
  33        u64                     xtime_nsec;
  34
  35        /* Difference between accumulated time and NTP time in ntp
  36         * shifted nano seconds. */
  37        s64                     ntp_error;
  38        /* Shift conversion between clock shifted nano seconds and
  39         * ntp shifted nano seconds. */
  40        u32                     ntp_error_shift;
  41
  42        /*
  43         * wall_to_monotonic is what we need to add to xtime (or xtime corrected
  44         * for sub jiffie times) to get to monotonic time.  Monotonic is pegged
  45         * at zero at system boot time, so wall_to_monotonic will be negative,
  46         * however, we will ALWAYS keep the tv_nsec part positive so we can use
  47         * the usual normalization.
  48         *
  49         * wall_to_monotonic is moved after resume from suspend for the
  50         * monotonic time not to jump. We need to add total_sleep_time to
  51         * wall_to_monotonic to get the real boot based time offset.
  52         *
  53         * - wall_to_monotonic is no longer the boot time, getboottime must be
  54         * used instead.
  55         */
  56        struct timespec         wall_to_monotonic;
  57        /* Offset clock monotonic -> clock realtime */
  58        ktime_t                 offs_real;
  59        /* time spent in suspend */
  60        struct timespec         total_sleep_time;
  61        /* Offset clock monotonic -> clock boottime */
  62        ktime_t                 offs_boot;
  63        /* The raw monotonic time for the CLOCK_MONOTONIC_RAW posix clock. */
  64        struct timespec         raw_time;
  65        /* Seqlock for all timekeeper values */
  66        seqlock_t               lock;
  67};
  68
  69static inline struct timespec tk_xtime(struct timekeeper *tk)
  70{
  71        struct timespec ts;
  72
  73        ts.tv_sec = tk->xtime_sec;
  74        ts.tv_nsec = (long)(tk->xtime_nsec >> tk->shift);
  75        return ts;
  76}
  77
  78
  79#ifdef CONFIG_GENERIC_TIME_VSYSCALL
  80
  81extern void update_vsyscall(struct timekeeper *tk);
  82extern void update_vsyscall_tz(void);
  83
  84#elif defined(CONFIG_GENERIC_TIME_VSYSCALL_OLD)
  85
  86extern void update_vsyscall_old(struct timespec *ts, struct timespec *wtm,
  87                                struct clocksource *c, u32 mult);
  88extern void update_vsyscall_tz(void);
  89
  90static inline void update_vsyscall(struct timekeeper *tk)
  91{
  92        struct timespec xt;
  93
  94        xt = tk_xtime(tk);
  95        update_vsyscall_old(&xt, &tk->wall_to_monotonic, tk->clock, tk->mult);
  96}
  97
  98#else
  99
 100static inline void update_vsyscall(struct timekeeper *tk)
 101{
 102}
 103static inline void update_vsyscall_tz(void)
 104{
 105}
 106#endif
 107
 108#endif /* _LINUX_TIMEKEEPER_INTERNAL_H */
 109
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